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https://issues.apache.org/jira/browse/ZOOKEEPER-3141?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16610124#comment-16610124
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Michael Han commented on ZOOKEEPER-3141:
----------------------------------------
The address `fee.fii.foo.fum` was from another test case in same file:
[testBadPeerAddressInQuorum|
https://github.com/apache/zookeeper/blob/master/src/java/test/org/apache/zookeeper/server/quorum/QuorumPeerMainTest.java#L597].
One possibility is apache Jenkins was running multiple test cases and for some
reasons, one test case (testBadPeerAddressInQuorum) interferes the other
(testLeaderElectionWithDisloyalVoter_stillHasMajority). I've seen some flaky
tests caused by interference between test cases, but this one is new to me.
I set up a stress test on apache jenkins just to run
testLeaderElectionWithDisloyalVoter_stillHasMajority alone and if the failure
does not reproduce then it's likely the interferences between test cases are
the cause.
> testLeaderElectionWithDisloyalVoter is flaky
> --------------------------------------------
>
> Key: ZOOKEEPER-3141
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3141
> Project: ZooKeeper
> Issue Type: Bug
> Components: leaderElection, server, tests
> Affects Versions: 3.6.0
> Reporter: Michael Han
> Priority: Major
>
> The unit test added in ZOOKEEPER-3109 turns out to be quite flaky.
> See
> [https://builds.apache.org/job/zOOkeeper-Find-Flaky-Tests/511/artifact/report.html]
> Recent failure builds:
> [https://builds.apache.org/job/ZooKeeper-trunk//181]
> [https://builds.apache.org/job/ZooKeeper-trunk//179]
> [https://builds.apache.org/job/PreCommit-ZOOKEEPER-github-pr-build/2123/testReport/junit/org.apache.zookeeper.server.quorum/QuorumPeerMainTest/testLeaderElectionWithDisloyalVoter_stillHasMajority/]
>
>
> Snapshot of the failure:
> {code:java}
> org.apache.zookeeper.server.quorum.QuorumPeerMainTest.testLeaderElectionWithDisloyalVoter_stillHasMajority
> Error Message
> Server 0 should have joined quorum by now
> Stacktrace
> junit.framework.AssertionFailedError: Server 0 should have joined quorum by
> now
> at
> org.apache.zookeeper.server.quorum.QuorumPeerMainTest.testLeaderElection(QuorumPeerMainTest.java:1482)
> at
> org.apache.zookeeper.server.quorum.QuorumPeerMainTest.testLeaderElectionWithDisloyalVoter_stillHasMajority(QuorumPeerMainTest.java:1431)
> at
> org.apache.zookeeper.JUnit4ZKTestRunner$LoggedInvokeMethod.evaluate(JUnit4ZKTestRunner.java:79)
> {code}
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